2 bolts are better when it comes to a 400.Message me and I will leave my phone number.

 

You have PM.

Funny you say that about the mains. I've heard that before but had no explaination of why. I figured maybe 2 bolt is better for more structure. The main with 4 holes would be more apt to stress with the missing mass. That was my guess but I never knew for sure.

 

Forgot to mention, I do have a 377, but it is a standard bore(new GM block) stroker. In other words, it's what would normally be a 383, but without being bored .030" over. It is going into my 1970 Monte Carlo.

 

$bolt 400SB have thin main webs. The later 2 bolt blocks with splayed 4 bolts caps are superior but, any 400SB core is challenged when making over 500HP (I know a low budget sprint car team that killed 3 blocks in one 6 month season with a talented "tuner" doing the motor work.) 6" rods don't make power but they allow hight piston speeds without killing the cylinder walls and lighter pistons to be run. I build a oversquare motor to RPM, I build 383's for trucks and low RPM street cars (low RPM meaning sub 7000 RPM.)

 

Sounds like you have a VERY fun job. Do you get a casual Friday every week too?

 

.I agree that a short stroke built correctly can be awesome. I'm no engine guru, but remember the SB 302? That was a de-stroked 327 with 4.00 x 3.00 correct? The problem with this engine was folks rev'd it too high and blew it. But for street fun there was nothing like it!

 

Anyone remember the 307? I had the pleasure once. It was an early SB that if I remember right, had limited oil flow to the inner cam bearings. They would sieze and spin. GM corrected the problem but dropped the 307 in favor of I think the 305?

 

The poor rod ratio, side loading of the block, high piston
speed, high amount of piston travel all good reasons not to build an engine with a long stroke that turns rpm for any length of time. A lower rpm drag motor OK. You put a long stroke in a roundy round motor and try to turn RPMS it will come a part.

 

Good info for sure. I liked the 'Roundy round' part.

 

Nascar engines are 3.25 stroke and 6" or 6.25" rods for just that reason. They run 9000 RPM for hours. They also only run 500 miles between rebuilds.

 

How many of us here are turning 9000 rpm for hours. Most motors here rarely see 6000 rpm. Are you going to build a street motor or a race motor. Pick your motor and build wisely.

 

No matter how much I hate watching NASCAR I love the technology that drives the cars. 9000 RPM for long periods just impresses me to no end. I wish I had the money to build a NASCAR motor with a more forgiving rod length.

 

They don't have pushrod problems to deal with but those formula
one cars that turn 18000-19000 go into a 180 corner never drop
below 14000, now thats a race motor.

 

Aren't those also 6 cylinder motors? Much less rotating mass I would assume.

 

Like this?

 

Wow...just, wow. !

 

I'm not sure any more last time I saw a write up on a formula
motor it was 180 cubic inch had titanium everthing and at the
time I think they were allowed 35 pounds of boost.

 

MOLTEN EXHAUST!! Another minute like that the whole motor would have melted.

 

Some are V8 and some are V10. I think they are around 2.4 liters?

Never get tired of watching that video

 

Just saw the video I could hear that long stroker rev very quickly
up and down very fast.